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                <h1 class="title-article">同时使用Python2和Python3</h1>
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                    <span class="article-type type-1 float-left">原创</span>                                                                                                                                            <a class="follow-nickName" href="https://me.csdn.net/naiba01" target="_blank" rel="noopener">naiba01</a>
                    <span class="time">最后发布于2016-10-31 22:51:14                    </span>
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                                <div class="up-time">发布于2016-10-31 22:51:14</div>
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        <!--python安装手册开始-->
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                                            <blockquote>
  <p>使用过node.js的同学都知道，我们经常需要切换node.js的版本。而在Python的开发过程中，我们也会遇到需要在Python2和Python3之间切换的情况。就像之前我学习爬虫，一开始我用Python2.7，后来买了一本教程想系统学习一下爬虫。可是教程使用的是Python3.x。那我就纠结了：怎样能够不卸载Python2同时又能使用Python3呢？于是，我研究了一番，并总结如下。</p>
</blockquote>



<h2 id="安装">安装</h2>

<ol>
<li>从<a href="https://www.python.org/downloads/" rel="nofollow">官网</a>或者<a href="http://python.freelycode.com/" rel="nofollow">Python部落</a>都可以下载Python2.x和Python3.x的版本，注意一下系统就好 <br>
<br></li>
<li>将Python2.x和Python3.x安装到不同的文件夹里面。例如，Windows下<code>D:\Program Files\Python2</code>和<code>D:\Program Files\Python3</code>  <br>
<br></li>
<li>将Python2和Python3的安装路径和下一级的<code>\Scripts</code>文件夹的路径添加到环境变量里面。</li>
</ol>



<h2 id="解法">解法</h2>



<h4 id="野路子解法">野路子解法</h4>

<p>将其中一个运行文件如Python2下的python.exe的名字改成python2.exe，那么在运行Python2的文件时这样就可以： <br>
<code>python2 test.py</code> <br>
可是这样会导致改了名字的python对应的pip无法使用。</p>



<h4 id="官方解法">官方解法</h4>

<p>在安装Python3(&gt;=3.3)时，python的安装包实际上在系统安装了一个启动器py.exe，默认放置在文件夹C:\Windows\下面。这个启动器允许我们指定使用Python2还是Python3来运行代码（当然前提是你已经成功安装了Python2和Python3）。 <br>
<br>
假设你有一个Python2的文件test.py，你可以这样运行它</p>

<blockquote>
  <p>py -2 test.py</p>
</blockquote>

<p>类似，要运行Python3的文件，只要这样</p>

<blockquote>
  <p>py -3 test.py</p>
</blockquote>

<p>其实，py.exe允许你在代码中表明该文件是使用Python2还是Python3解释，只要你在.py文件的开头加上(注意放在<code># -*- coding: utf-8 -*-</code>前面)</p>

<pre class="prettyprint"><code class="language-python hljs "><span class="hljs-comment">#! python2</span></code></pre>

<p>或者</p>



<pre class="prettyprint"><code class="language-python hljs "><span class="hljs-comment">#! python3</span></code></pre>

<p>然后</p>

<blockquote>
  <p>py test.py</p>
</blockquote>

<p>就能使用Python2或Python3解释。 <br>
<br>
另外，使用pip安装工具就可以这样：</p>

<blockquote>
  <p>py -2 -m pip install package-name</p>
</blockquote>

<p>或者</p>

<blockquote>
  <p>py -3 -m pip install package-name</p>
</blockquote>

<p>掌握了以上的技巧，就可以随意使用Python2和Python3了。</p>                                    </div>
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